Miramare has been one of the first Italian MPAs to be officially established (decree of 12.11.1986), and it is entrusted to the Italian Association for WWF for Nature. Managing services were transferred to WWF OASI with Ministry authorization. It is also a UNESCO-MAB Biosphere Reserve.

Miramare MPA is located in the Gulf of Trieste (Northern Adriatic, Italy), around a natural promontory that commands Grignano bay, on which the Castle of Miramare is placed. It includes a coastline of 1.700 meters and an offshore area of 120 hectares, divided into a core zone (30 hectares) and a buffer zone (90 hectares), subsequently established with an ordinance issued by Trieste Harbour Office.